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Search Results: 1 - 10 of 1192 matches for " Alexandru Dobrovicescu "
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The Influence of Swirl Angle on the Irreversibilities in Turbulent Diffusion Flames
Dorin Stanciu,Mircea Marinescu,Alexandru Dobrovicescu
International Journal of Thermodynamics , 2007, DOI: 10.5541/ijot.198
Abstract: The objective of this paper is to investigate the volumetric irreversibilities of turbulent swirling diffusion flames. The theoretical background of analysis relies on the local transport exergy equation, which allows the formulation of the well-known Gouy-Stodola theorem at the continuum level. It is already known that, in the case of turbulent flame, the chemical, thermal and mass diffusion irreversibilities represent in order of enumeration the predominant sources of exergy destruction. But these irreversibilities have a more complicated structure than in the laminar flames because the turbulent fluctuations generate new and important irreversibility sources, strongly influencing all the mechanisms mentioned above. Using numerical techniques for flow and multi-species balance equations, this paper tries to emphasize the role of both, swirling number and turbulent intensity field, not only in the burning process intensification but also in the irreversibility creation.
Optimisation exergo-économique d’une turbine à gaz Exergoeconomic Optimization of a Gas Turbine
Dobrovicescu A.,Grosu L.
Oil & Gas Science and Technology , 2012, DOI: 10.2516/ogst/2012011
Abstract: Ce travail concerne l’optimisation exergo-économique d’une turbine à gaz. La méthode d’optimisation exergo-économique est comparée avec la méthode thermoéconomique. Il est mis en évidence que l’optimisation exergoéconomique offre des études et raisonnements supplémentaires qui ne sont pas disponibles en se limitant à une optimisation énergétique classique. L’objectif d’une optimisation exergo-économique d’un système énergétique est de trouver la structure optimale et les paramètres de fonctionnement optimum qui minimisent le co t global du système, sous des contraintes imposées de fonctionnement, de maintenance et d’impact sur l’environnement. Cette optimisation est réalisée en étudiant l’évolution de paramètres exergétiques locaux et globaux. The paper deals with the exergoeconomic optimization of a gas turbine system. A parallel between thermoeconomic and exergoeconomic optimization is carried on. It is pointed out that exergoeconomics offers additional capabilities in optimization that are not available with the conventional technic optimization. The goal of exergoeconomic design optimization of an energy systems is to find the structure and the values of the system parameters that minimize the cost of final products considering restrictions imposed by the desired reliability, maintainability, operability and environmental impact of the system, using local or global exergetic parameters.
Two Analytical Methods for Detection and Elimination of the Static Hazard in Combinational Logic Circuits  [PDF]
Mihai Grigore Timis, Alexandru Valachi, Alexandru Barleanu, Andrei Stan
Circuits and Systems (CS) , 2013, DOI: 10.4236/cs.2013.47061

In this paper, the authors continue the researches described in [1], that consists in a comparative study of two methods to eliminate the static hazard from logical functions, by using the form of Product of Sums (POS), static hazard “0”. In the first method, it used the consensus theorem to determine the cover term that is equal with the product of the two residual implicants, and in the second method it resolved a Boolean equation system. The authors observed that in the second method the digital hazard can be earlier detected. If the Boolean equation system is incompatible (doesn’t have solutions), the considered logical function doesn’t have the static 1 hazard regarding the coupled variable. Using the logical computations, this method permits to determine the needed transitions to eliminate the digital hazard.

Logical Function Decomposition Method for Synthesis of Digital Logical System Implemented with Programmable Logic Devices (PLD)  [PDF]
Mihai Grigore Timis, Alexandru Valachi, Alexandru Barleanu, Andrei Stan
Circuits and Systems (CS) , 2013, DOI: 10.4236/cs.2013.47062

The paper consists in the use of some logical functions decomposition algorithms with application in the implementation of classical circuits like SSI, MSI and PLD. The decomposition methods use the Boolean matrix calculation. It is calculated the implementation costs emphasizing the most economical solutions. One important aspect of serial decomposition is the task of selecting best candidate variables for the G function. Decomposition is essentially a process of substituting two or more input variables with a lesser number of new variables. This substitutes results in the reduction of the number of rows in the truth table. Hence, we look for variables which are most likely to reduce the number of rows in the truth table as a result of decomposition. Let us consider an input variable purposely avoiding all inter-relationships among the input variables. The only available parameter to evaluate its activity is the number of ls or Os that it has in the truth table. If the variable has only 1 s or 0 s, it is the best candidate for decomposition, as it is practically redundant.

Taming the Economic Crisis - a Stringent Necessity for Romania
Alexandru SALCEANU
Risk in Contemporary Economy , 2012,
Abstract: At the beginning of this century, the financial globalisation, reflected by the integration of capital markets, gained a positive effect by leading the resources to their most productive place, contributing at the same time to the development of poorer areas. However, in time, due to a set of disturbing factors that operated upon the financial and monetary market, there appeared fallouts, present since 2006-2008, that generated the global economic crisis which was reported by some more rational experts, but ignored by banks, businessmen, governments, etc. Today, this crisis acts powerfully, without any concrete signs of improvement and the actions that were taken have failed to mitigate its negative consequences. In this case Romania, respecting the European and global context, must act through the determined effort of all actors of the economic environment in order to overcome this situation, by the improvement of natural resources (particularly agricultural), the growth of absorption of the European funds, the increment of foreign direct investments, the increment of competitiveness, reducing unemployment, reforming the administrative system which is too expensive under current circumstances. This challenge can be done if we bear in mind that during these years of crisis Poland has succeeded in achieving economic growth using concrete measures and leaving aside group interests.
How Did We Get to the Deficit Spectrum of the Economic Crisis?
Alexandru Bodislav
Romanian Journal of Fiscal Policy , 2012,
Abstract: The economies of developed countries of the 21st century benefit from the unseen-till-now prosperity; life standard that suffered a hard landing starting with 2007 and that seems to evolve in a chain-saw model for the crisis development. The forecast is based on the “first in, last out” principle; first in – the US, last out – the emergent countries that are under the contagion process and under inefficient governance and which started as a subprime crisis and continues as a deficit crisis. These nations produced one of the highest life standards in history. How was this possible? It is believed that the origin of this prosperity (before and after the crisis) is in the development of an economic system that embraces the free enterprise, capitalism and competition because prosperity represents is the crossroad between the self interests of many.This research paper tries to underline the factors that led to the actual development of the crisis; from the bankruptcy of Lehman Brothers to the unstable and not well directed actions of governments around the world and to these first tier layers there are added the second tier layers that include the political vantage point that influences the paths that are followed for limiting the negative aspects of the economic crisis and to improve new opportunities that appear as a result of openness and collaboration. The muddling through principle was adopted by the Obama Administration and this fact is one of the main factors that ease the deployment of near future economic improvement for the United States, but for the long run this isn’t a solution to develop a healthy economy and create sustainable economic growth.
Optimal Parameters for Nearest Neighbor Deblurring Algorithm
Alexandru Kuzmin
Lecture Notes in Engineering and Computer Science , 2007,
Les services de paiement sur le marché de l’Union Européenne et de L’Espace économique Européen, pendant la crise économique actuelle
Alexandru BULEARC?
Juridical Tribune , 2011,
Abstract: From 1 November 2009 came into force Emergency Ordinance No. 113/2009, which introduced into Romanian legislation the Directive on Payment Services (PSD "Payment Services Directive") applicable in the European Union (EU) and European Economic Space (EES). These regulations are intended transparency of banking information for payment services to create a single legal framework at the European Union and European Economic Space in the field of payment services and the protection of consumers of these services. The regulations of the Directive on payment services are applied to all payment transactions in the currency of each Member State of the European Union and European Economic Space, provided that the two banks - the payer's bank and the beneficiary's bank – are located in a Member State. Payment services coming under the impact of new legislation are: payment by bill of exchange, electronic payments, payments by credit card, payments made by direct debit, cash transactions, provided the payment and transfer of funds (the giving of money) under conditions of transparency and information to users and to comply with a set of laws and obligations on the part of all those involved in this operation.
Alexandru GAVRI?
JURA : Journal of Urban and Regional Analysis , 2010,
Abstract: This article outlines the perception of the urban image at micro-territorial level based on an analysis of data resulting from a survey conducted in large human habitats in Bucharest. The identification so achieved reflects numerous spatial similarities of the perceptions of the urban image. The landmarks that the residents of Bucharest have in this respect are in line with the built areas as well as those related to the basic destinations of everyday life. This gives rise to quite a big issue: the people of Bucharest living in such large dwelling compounds are restricted to a superficial knowledge of space. They are impacted by a much too quickly changing urban policy and by permissive building investment rules that have lead to a variegated puzzle of post-communist restructurings where essence is attached to just trivial landmarks..
Alexandru MIHU?
Societate ?i Politic? , 2011,
Abstract: During the development of social politics, philosophyand medicine in relation to human dignity, they have been involved in theprocesses of evolution and involution which unfortunately can still be feltnowadays, both on a global and a national level. The Universal Declaration ofHuman Rights (adopted by the General Assembly of the U.N. on December 10,1948), the UNESCO’s Constituting Act (in its Head Note), The UniversalDeclaration on Bioethics and Human Rights (adopted by the UNESCO onOctober 19, 2005) also stress out the respect for human dignity. The Law No. 95/ 2006 and the Code of Medical Professional Ethics focuses on the rights of thepatient, its quintessence being the right to choose one’s physician, and therespect for the patient’s dignity appears as a corollary of these rights. The keyissue of the new Civil Code focuses on “the life, health, physical and mentalintegrity of any person” which are equally guaranteed and protected. Section 61(1) “The interest and welfare of the human being must take precedence over theunique interest of society or science” – Section 61 (2).
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